I have read to dip adenium seedlings in rooting hormones like clonex when potting up. Is that a good idea?

I wouldn't bother. Let the cutting sit on the counter for a couple days to scab over then plant it (with just the end in the soil) in barely damp cactus potting mix.

BTW, Adeniums grown from cuttings will not grow a caudex.

I just happened to watch a YouTube video yesterday, where they took adenium cuttings, and let them dry out for seven days before they did the potting thing, which does not differ that much from what Daisy1 offered. Ironically, this video proposed that powdered ginger be sprinkled on the surface, instead of rooting powder. They also showed how to take a cutting of a particular coloured adenium, and graft it unto another adenium of a different colour, and seal the graft with crazy glue, the outcome being multi-coloured adeniums on the same plant. I was impressed, but so far, I have only seen plain pink colour from my 19 adeniums, (actually only two have bloomed so far over 8 years)LOL.

mongerj said:I have read to dip adenium seedlings in rooting hormones like clonex when potting up. Is that a good idea?

Rooting hormone is not needed when potting up adenium seedlings. I have potted up a couple hundred adenium seedlings and apply rooting powder only on those that I cut off the tap root when about six weeks old. And I plant immediately in moist media that has 60% perlite.

The powder also contains a fungicide that helps prevent rotting. Cutting the tap root at a very young age makes the plant grow a very fat caudex base. Never allow the media to dry out completely for young seedlings.